Ghosh, R. C., Singhal, R. M. and Pathak, T. C. (1977) “Comparative Determination of the Spectral Properties and Colloidal Behaviour of Humic Acids of Sal Forest Soils of Doon Valley Planted with <I>Eucalyptus</I>”;, Indian Forester, 103(11), pp. 701–707. doi: 10.36808/if/1977/v103i11/11821.